稀土掺杂钇铝石榴石晶体激光光纤的研究进展  

Research Progress of Rare Earth Doped Yttrium Aluminum Garnet CrystalLaser Fiber

作　　者：申冰磊 王中跃 于春雷[2] 王欣[2] 王世凯[2] 胡丽丽[2] 韦玮 SHEN Binglei;WANG Zhongyue;YU Chunlei;WANG Xin;WANG Shikai;HU Lili;WEI Wei(College of Electronics and Optical Engineering&College of Microelectronics,Nanjing University of Posts and Telecommunications,Nanjing 210023,China;High Power Laser Unit Technology Laboratory,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China)

机构地区：[1]南京邮电大学电子与光学工程学院、微电子学院,南京210023 [2]中国科学院上海光学精密机械研究所高功率激光单元技术实验室,上海201800

出　　处：《材料导报》2021年第9期9123-9132,共10页Materials Reports

基　　金：国家自然科学基金(51502144,61775224)。

摘　　要：受激布里渊散射(SBS)和热管理限制了玻璃光纤在光纤激光器中极限输出功率的提高。钇铝石榴石(YAG)晶体光纤结合了晶体和光纤的优点,相较于玻璃光纤,它的SBS增益系数低得多,可以有效地减小非线性效应和热损伤,为光纤激光器研究提供了新的方向。YAG晶体在达到熔点(1970℃)后会迅速熔化成低粘度液体,不利于晶体光纤的制备;制备YAG晶体纤芯/玻璃包层的复合光纤是研究YAG晶体光纤的主要方法,但是存在YAG晶体纤芯玻璃化、纤芯与包层间的成分扩散以及数值孔径过大的问题;未掺杂的YAG晶体作为稀土掺杂的YAG晶体纤芯的包层生长困难,有待于进一步研究。目前多采用激光加热基座生长技术(LHPG)和微下拉法(μ-PD)制备YAG晶体光纤,且制得的光纤质量较好;对YAG晶体光纤的研究,重点在于采用折射率、热膨胀与YAG晶体相匹配的玻璃或晶体作为包层,并探索复合工艺,减小数值孔径和减少纤芯与包层间的扩散,现有文献报道的最大输出功率达到590 W。本文介绍了几种YAG晶体光纤的制备方法,对国内外关于无包层稀土掺杂YAG晶体光纤、玻璃包层稀土掺杂YAG晶体复合光纤、YAG晶体包层晶体光纤及YAG晶体光纤与传统无源光纤器件的熔接的研究现状进行了综述,并对目前的研究状况进行了总结与展望。Stimulated Brillouin scattering(SBS)and thermal management limit the increase of the ultimate output power of glass fibers in fiber lasers.Yttrium aluminum garnet(YAG)crystal fiber combines the advantages of crystal and fiber.Compared with glass fiber,its SBS gain coefficient is lower,Which can effectively reduce nonlinear effects and thermal damage,and provide a new direction for fiber laser research.After the YAG crystal reaches the melting point(1970℃),it will quickly melt into a low-viscosity liquid,which is not conducive to the preparation of crystal fiber.Preparation of YAG crystal core/glass cladding composite fiber is the main method to study YAG crystal fiber,but there are problems of vitrification of YAG crystal core,component diffusion between core and cladding,and excessive numerical aperture.It is difficult to grow undoped YAG crystal as the cladding layer of the rare-earth-doped YAG crystal core,and further research is needed.At present,the YAG crystal fiber is prepared by laser heating pedestal growth technology(LHPG)and micro pull-down method(μ-PD),and the quality of the prepared fiber is better.The research on YAG optical fiber focuses on using glass or crystal with matching refractive index and thermal expansion as YAG crystal as the cladding,and exploring the composite process to reduce the numerical aperture and reduce the diffusion between the core and the cladding.The maximum output power reported in the existing paper is 590 W.This article introduces several preparation methods of YAG crystal fiber,and status of the unclad rare earth doped YAG crystal fiber,glass cladding rare earth doped YAG crystal composite fiber,YAG crystal cladding crystal fiber and fusion of YAG crystal fiber and traditional passive fiber device is reviewed,The current research status is summarized and forecasted.

关 键 词：光纤 钇铝石榴石 晶体光纤 制备方法 复合光纤 

分 类 号：TQ342.82[化学工程—化纤工业]